<template>
	<div class="list" ref="wrapper">
		<div>
			<div class="area">
				<div class="title border-topbottom">当前城市</div>
				<div class="button-list">
					<div class="button-wrapper">
						<div class="button">{{this.currentCity}}</div>
					</div>
				</div>
			</div>
			<div class="area">
				<div class="title border-topbottom">热门城市</div>
				<div class="button-list">
					<div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
						<div class="button">{{item.name}}</div>
					</div>
				</div>
			</div>
			<div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
				<div class="title border-topbottom">{{key}}</div>
				<div class="item-list">
					<div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id" @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
				</div>
			</div>
		</div>
	</div>
</template>
<script>
// 引用滚动插件
import BScroll from 'better-scroll'
import { mapState,mapMutations } from 'vuex'
export default {
  name: 'CityList',
  // props接收父组件传过来的值
  props:{
  	hot:Array,
  	cities:Object,
  	letter:String
  },
  computed:{
  	...mapState({
  		currentCity:'city'
  	})
  },
  methods:{
  	handleCityClick(city){
  		this.changeCity(city);
  		this.$router.push('/');
  	},
  	...mapMutations(['changeCity'])
  },
  mounted (){
  	this.scroll = new BScroll(this.$refs.wrapper)
  },
  // watch侦听器
  watch:{
  	// 监听letter的变化
  	letter (){
  		if(this.letter){
  			const element = this.$refs[this.letter][0];
  			this.scroll.scrollToElement(element)
  		}
  	}
  }
}
</script>
<style scoped>
	.border-topbottom:before{
		border-color: #ccc;		
	}
	.border-topbottom:after{
		border-color: #ccc;		
	}
	.border-bottom:before{
		border-color: #ccc;		
	}
	.list{
		position: absolute;
		top: 1.58rem;
		left: 0;
		right: 0;
		bottom: 0;
		overflow: hidden;
	}
	.title{
		line-height: .54rem;
		background-color: #eee;
		color: #666;
		padding-left: .2rem;
		font-size: .26rem;
	}
	.button-list{
		padding: .1rem .6rem .1rem .1rem;
		overflow: hidden;
	}
	.button-wrapper{
		width: 33.33%;
		float: left;
	}
	.button{
		margin: .1rem;
		padding: .1rem 0;
		text-align: center;
		border:.02rem solid #ccc;
		border-radius: .06rem;
	}
	.item-list{
		line-height: .76rem;
		padding-left: .2rem
	}
</style>